AD8436

Rev. 0 | Page 16 of 20

AD8436 EVALUATION BOARD

The AD8436-EVALZ provides a platform to evaluate AD8436

performance. The board is fully assembled, tested and ready to

use after the power and signal sources are connected. Figure 45

is a photograph of the board. Signal connections are located

on the primary and secondary sides, with power and ground

on the inner layers. Figure 40, Figure 41, Figure 42, Figure 43,

and Figure 44 illustrate the various design details of the board,

including a basic layout and copper patterns. These figures are

useful for reference for application designs.

A Word About Using the AD8436 Evaluation Board

The AD8436-EVALZ offers many options, without sacrificing

simplicity. The board is tested and shipped with a 10 μF averaging

capacitor (CAVG), 3.3 μF low-pass filter capacitor (C8) and a

0.1 μF (COPT) capacitor to optimize crest factor performance.

To evaluate minimum cost applications, remove C8 and COPT.

The functions of the five switches are listed in Table 6.

Table 6.

Switch

Function

CORE_BUFFER

Selects core or input for the input signal

INCOUP

Selects ac or dc coupling to the core

SDCOUT

Selects the output buffer or the core

output at the DCOUT BNC.

IBUF_VCC

Enable or disables the input buffer

OBUF_VCC

Enable or disables the output buffer

All the I/Os are provided with test points for easy monitoring

with test equipment. The input buffer gain default is unity; for

2× gain, install a 0603 0 Ω resistor at Position R5. For higher

IBUF gains, remove the 0 Ω resistor at Position RFBH (there is

an internal 10 kΩ resistor from the OBUF_OUT to IBUFIN−)

and install a smaller value resistor in Position RFBL. A 100 Ω

resistor establishes a gain of 100×.

Single supply operation requires removal of Resistor R6 and

installing a 0.1 μF capacitor in the same position for noise

decoupling.

Figure 40. Assembly of the AD8436-EVALZ

Figure 41. AD8436-EVALZ Primary Side Copper

Figure 42. AD8436-EVALZ Secondary Side Copper

Figure 43. AD8436-EVALZ Power Plane

Figure 44. AD8436-EVALZ Ground Plane